![]() ![]() Use #pgrep vnc to retrieve the current VNC session ID.If you need to regain access to your VNC, follow these steps: If VNC Viewer error ”The too many authentication failures” is experienced, this could indicate that someone is using brute force attacks to try and gain access to your server. Also change the VNC Viewer Encryption to Server, PreferOn or PreferOff. If that doesn’t resolve the problem, change your VNC Server encryption parameter to one of the other settings other than AlwaysOff. To try to resolve this, check for the latest versions of the VNC Connect and VNC Server applications and make sure to upgrade accordingly. Sometimes you can see the “ No Matching Security Types” error message because of these reasons. ![]() The version of VNC server may not support encryption.The encryption settings for a direct connection between the Server and the Viewer are not compatible.Unable to Connect to VNC Server Using Your Chosen Security Setting To rectify this, simply remove the blocked IP from the list and add it to /etc/hosts.allow instead. If the IP of the user is listed in /etc/ny you will not be able to connect. If you use additional displays, make sure to open those ports too, for example 58 ports for the first display, 58 for the second one. Make sure that ports 58 are open on your firewall. Simply restart the service using the “ service vncserver start” command. Possible reasons why you’re experiencing this problem: If you are using multiple displays you can use any port from 5901. Make sure the VNC Server is configured to use that port. ![]()
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